Employee Benefit Plans, Supplemental Executive Retirement Plan (Details) - Supplemental Executive Retirement Plan [Member] $ in Millions	12 Months Ended
	Jun. 30, 2021 USD ($) Installment	Jun. 30, 2020 USD ($)
Supplement Executive Retirement Plan [Abstract]
Vesting period	10 years
Period in which lump sum benefit will be paid in the event of death, disability or termination	2 years
Number of annual installments in which benefit will be paid | Installment	10
Net periodic pension costs	$ 1.3	$ 1.0
Postemployment benefits liability	$ 8.2	$ 6.4
Deferred Base Salary [Member]
Supplement Executive Retirement Plan [Abstract]
Maximum annual contribution per employee	50.00%
Deferred Annual Bonus [Member]
Supplement Executive Retirement Plan [Abstract]
Maximum annual contribution per employee	100.00%